Radial pickup microphone enclosure
Radially expanding multiple flat-surfaced waveguide device
Radio and infrared receiving collapsible hearing device
Radio attachable to spectacles
Radio, infrared, and audio assistive listening device
Rainproof and omnidirectional loudspeaker system
Raised microstructure of silicon based device
Reactance-mass actuator
Receiver
Receiver and method of construction
Receiver and portable communication device
Receiver having an improved bobbin
Receiver-transmitter of communication equipment
Receptacle for earphone cord
Recessed audio speaker system
Recessed speaker box and mount
Recreational bone conduction audio device, system
Rectangular panel-form loudspeaker and its radiating panel
Rectangular transducer for panel-form loudspeaker
Reducing microphone puff noise